(7 13/15+6 6/12)+(2 4/16+5 11/5)
118/15+ 78/12=472/60 + 390/60=862/60=431/30 36/16 + 36/5= 180/80 + 576/80= 756/80=378/40=189/20 431/30 + 189/20= 862/60 + 567/60=1429/60= 23 49/60
(7 13/15+6 6/12)+(2 4/16+5 11/5)=7 52/60+6 30/60+2 15/60+5 220/60=25 17/60